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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
     <script src="vue3.js"></script>
    <div id="app">
        <h1 v-html="title"></h1>
        <p v-text="poem"></p>
        <button v-on:click="togglePoem">显示/隐藏诗词</button>
    </div>
    <script>
        const comApp = Vue.createApp({
            data(){
                return {
                    title:"<span style='color:red;'>静夜思</span>",
                    poem:"床前明月光,疑是地上霜。",
                    showPoem:false,
                }
            },
            methods:{
                togglePoem(){
                    this.showPoem = ! this.showPoem;
                    if(this.showPoem){
                        this.poem+="举头望明月,低头思故乡。";
                    }else{
                        this.poem = "床前明月光,疑是地上霜。";
                    }
                },
            },
        }).mount("#app");
    </script>
</body>
</html>